A parallel LED string driver using capacitors for source and string ground separation

Ruihong Zhang; Henry Shu-Hung Chung

doi:10.1109/ECCE.2014.6954121

A parallel LED string driver using capacitors for source and string ground separation

Ruihong Zhang
, Henry Shu-Hung Chung

Centre for Smart Energy Conversion and Utilization Research

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

2 Citations (Scopus)

Abstract

A parallel LED string driver using capacitors for source and string ground separation is proposed. The methodology is based on connecting multiple transformers in a daisy chain and using capacitor network in every LED strings to balance the string currents. The grounds of the input source and the output strings are also separated by the capacitor network. A 21W prototype with 7 strings has been built. Each string consists of three 1W LEDs connected in series. Experimental results show that the variation of LED string current can still be less than ±1% even if the string voltages have significant differences. The current level and variation of healthy LED strings will not be affected by any failed LEDs. The string current can be dimmed from 100% to 10%. Modeling, analysis, and design of the proposed driver will be given.

Original language	English
Title of host publication	2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014
Publisher	IEEE
Pages	5249-5256
ISBN (Print)	9781479956982
DOIs	https://doi.org/10.1109/ECCE.2014.6954121
Publication status	Published - 11 Nov 2014

Access Output

10.1109/ECCE.2014.6954121

Other Access Options

Check CityUHK Library

Permanent Link

Right click to copy link

Cite this

@inproceedings{c9654e3a14974b849ea79e50ae043d59,

title = "A parallel LED string driver using capacitors for source and string ground separation",

abstract = "A parallel LED string driver using capacitors for source and string ground separation is proposed. The methodology is based on connecting multiple transformers in a daisy chain and using capacitor network in every LED strings to balance the string currents. The grounds of the input source and the output strings are also separated by the capacitor network. A 21W prototype with 7 strings has been built. Each string consists of three 1W LEDs connected in series. Experimental results show that the variation of LED string current can still be less than ±1\% even if the string voltages have significant differences. The current level and variation of healthy LED strings will not be affected by any failed LEDs. The string current can be dimmed from 100\% to 10\%. Modeling, analysis, and design of the proposed driver will be given.",

author = "Ruihong Zhang and Chung, \{Henry Shu-Hung\}",

year = "2014",

month = nov,

day = "11",

doi = "10.1109/ECCE.2014.6954121",

language = "English",

isbn = "9781479956982",

pages = "5249--5256",

booktitle = "2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014",

publisher = "IEEE",

address = "United States",

}

A parallel LED string driver using capacitors for source and string ground separation. / Zhang, Ruihong; Chung, Henry Shu-Hung.
2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014. IEEE, 2014. p. 5249-5256 6954121.

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

TY - GEN

T1 - A parallel LED string driver using capacitors for source and string ground separation

AU - Zhang, Ruihong

AU - Chung, Henry Shu-Hung

PY - 2014/11/11

Y1 - 2014/11/11

N2 - A parallel LED string driver using capacitors for source and string ground separation is proposed. The methodology is based on connecting multiple transformers in a daisy chain and using capacitor network in every LED strings to balance the string currents. The grounds of the input source and the output strings are also separated by the capacitor network. A 21W prototype with 7 strings has been built. Each string consists of three 1W LEDs connected in series. Experimental results show that the variation of LED string current can still be less than ±1% even if the string voltages have significant differences. The current level and variation of healthy LED strings will not be affected by any failed LEDs. The string current can be dimmed from 100% to 10%. Modeling, analysis, and design of the proposed driver will be given.

AB - A parallel LED string driver using capacitors for source and string ground separation is proposed. The methodology is based on connecting multiple transformers in a daisy chain and using capacitor network in every LED strings to balance the string currents. The grounds of the input source and the output strings are also separated by the capacitor network. A 21W prototype with 7 strings has been built. Each string consists of three 1W LEDs connected in series. Experimental results show that the variation of LED string current can still be less than ±1% even if the string voltages have significant differences. The current level and variation of healthy LED strings will not be affected by any failed LEDs. The string current can be dimmed from 100% to 10%. Modeling, analysis, and design of the proposed driver will be given.

UR - https://www.scopus.com/pages/publications/84934287796

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84934287796&origin=recordpage

U2 - 10.1109/ECCE.2014.6954121

DO - 10.1109/ECCE.2014.6954121

M3 - RGC 32 - Refereed conference paper (with host publication)

SN - 9781479956982

SP - 5249

EP - 5256

BT - 2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014

PB - IEEE

ER -

A parallel LED string driver using capacitors for source and string ground separation

Abstract

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Cite this